Re: [w3ctag/design-reviews] Review Decentralized identifiers (DIDs) (#216)

@hadleybeeman: "type the DID into the URL bar in a browser": 

http curl example for `did:ipid:12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew`

curl -s https://ipfs.io/api/v0/name/resolve?arg=12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew

>  {"Path":"/ipld/zdpuAyyen4DeAzm2pvc3h9TP3qkCnYUYN1sa9kSu9Tcub1XoY"}

followed by:  

curl -s https://ipfs.io/api/v0/dag/get?arg=zdpuAyyen4DeAzm2pvc3h9TP3qkCnYUYN1sa9kSu9Tcub1XoY
>
`{
  "@context": {
    "/": "zdpuAqceEaefp2YLbsyVaoJk8NH47qJvomsd1WouNC1CVYTZn"
  },
  "control": [
    {
      "signer": [
        "did:eth:0xd3382e07f2173270ef43817ab1b4e1cdeb36f23b",
        "did:sov:8uQhQMGzWxR8vw5P3UWH1j",
        "did:ipid:QmcEF77C6QKj6Rzru7MR2N5tSM33PHQYEqXYzQuVHHAvvv"
      ],
      "type": "OrControl"
    }
  ],
  "created": "2017-09-24T17:00:00Z",
  "id": "did:ipid:QmcEF77C6QKj6Rzru7MR2N5tSM33PHQYEqXYzQuVHHAvvv",
  "owner": [
    {
      "curve": "ed25519",
      "expires": "2017-11-08T16:02:20Z",
      "id": "did:ipid:QmcEF77C6QKj6Rzru7MR2N5tSM33PHQYEqXYzQuVHHAvvv",
      "publicKeyBase64": "lji9qTtkCydxtez/bt1zdLxVMMbz4SzWvlqgOBmURoM=",
      "type": [
        "CryptographicKey",
        "EdDsaPublicKey"
      ]
    },
    {
      "expires": "2019-03-22T00:00:00Z",
      "id": "did:ipid:QmcEF77C6QKj6Rzru7MR2N5tSM33PHQYEqXYzQuVHHAvvv",
      "publicKeyPem": "----BEGIN PUBLIC KEY-----\r\nMIIBOgIBAAJBAKkbSUT9/Q2uBfGRau6/XJyZhcF5abo7b37I5hr3EmwGykdzyk8GSyJK3TOrjyl0sdJsGbFmgQaRyV\r\n-----END PUB",
      "type": [
        "CryptographicKey",
        "RsaPublicKey"
      ]
    }
  ],
  "previous": {
    "/": "zdpuArY8PA81cxdoNqsP42xT5itMHi6savk7GReyaVxBoCgkv"
  },
  "proof": "did:eth:0x37aea9fdc10874d4048806187cbf6325ee102018",
  "serviceEndPoints": [
    {
      "didAuth": "/ip4/108.241.29.84/tcp/1265/ipfs/QmZTefe4V1KYwLUfhGVMMBbAkAa4E9vynzSNx5vPtrG4dv"
    },
    {
      "didAuth": "/ip4/37.120.35.245/tcp/1265/ipfs/Qmcfd7YfViNyxa4LZ2ubrubKa2cPYzeL8pN9E7emPSAVk4"
    }
  ],
  "signature": {
    "created": "2016-02-08T16:02:20Z",
    "creator": "did:ipid:QmeJGfbW6bhapSfyjV5kDq5wt3h2g46Pwj15pJBVvy7jM3",
    "signatureValue": "IOmA4R7TfhkYTYW87z640O3GYFldw0yqie9Wl1kZ5OBYNAKOwG5uOsPRK8/2C4STOWF+83cMcbZ3CBMq2/gi25s=",
    "type": "ed25519Signature2017"
  },
  "updated": "2018-07-09T02:41:00Z"
}`


also can validate that the same content ID:

curl -s https://ipfs.io/api/v0/dag/get\?arg\=zdpuAyyen4DeAzm2pvc3h9TP3qkCnYUYN1sa9kSu9Tcub1XoY | ipfs dag put
> zdpuAyyen4DeAzm2pvc3h9TP3qkCnYUYN1sa9kSu9Tcub1XoY


Does not depend on any single provider, could also be done via localhost, Cloudflare's server or any other gateway that supports the method resolution. 

https://ipfs.infura.io/api/v0/dag/get?arg=zdpuAyyen4DeAzm2pvc3h9TP3qkCnYUYN1sa9kSu9Tcub1XoY

http://localhost:5001/api/v0/name/resolve?arg=12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew

http://localhost:5001/api/v0/dag/get?arg=zdpuAyyen4DeAzm2pvc3h9TP3qkCnYUYN1sa9kSu9Tcub1XoY


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